The owner of a Bulli property tried desperately to save his home and business using a garden hose before it went up in flames.
Emergency services were called to the blaze about 8 o'clock yesterday morning at a storage shed behind Black Diamond Antiques on the Princes Highway.
It caused an estimated $30,000 worth of damage, which included a 1930s Riley motor car.
The owner, who lived inside the building and did not want to be named, was on site when the fire broke out.
He said he had owned the building for around 25 years.
The cause of the blaze is yet to be determined, however police are not treating it as suspicious.
Fire and Rescue NSW Inspector John Hawes said crews arrived to find the owner attempting to fight the fire, but removed him to the footpath for his own safety.
He said the "amazing amount of items in the shed" had hampered efforts to extinguish the fire, which was "burning fiercely".
Paramedics treated one fireman at the scene for a minor leg injury. The incident closed part of the Princes Highway for hours, delaying traffic.
A man renting storage space in the shed, who did not want to be named, said he lost about $5000 worth of uninsured equipment in the fire.
However, he said he wasn't too concerned.
"There were just bits of timber, a few old windows, old doors, that's it," he said. "I lost everything but that's all right.
"No-one's hurt, that's the main thing."
Fire crews from Corrimal, Bulli and Thirroul attended the scene.
No other buildings were damaged.
Meanwhile Wollongong police are still investigating a fire that destroyed an unoccupied house in Bourke Street, Fairy Meadow.
The blaze occurred about 1.30am on Tuesday, and police have taken a petrol can from the scene. A Wollongong police spokesman said the fire was still being treated as suspicious. However, he said there were no suspects at this stage.